I am using docker for export NFS, and I have already mapping all ports of NFS port to host OS.
I mount the NFS to client success, but when I try showmount failed.

root@ubuntu2:~# showmount 10.16.17.160
clnt_create: RPC: Port mapper failure - Unable to receive: errno 111 (Connection refused)
root@ubuntu2:~# mount -t nfs4 10.16.17.160:/mnt /mnt

NFS /etc/export
/mnt *(rw,sync,no_root_squash,no_subtree_check)

RPCInfo:
root@ubuntu2:~# rpcinfo -p 10.16.17.160
program vers proto port service
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100227 2 tcp 2049
100227 3 tcp 2049
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100227 2 udp 2049
100227 3 udp 2049
100021 1 udp 4011 nlockmgr
100021 3 udp 4011 nlockmgr
100021 4 udp 4011 nlockmgr
100021 1 tcp 4011 nlockmgr
100021 3 tcp 4011 nlockmgr
100021 4 tcp 4011 nlockmgr
100005 1 udp 4002 mountd
100005 1 tcp 4002 mountd
100005 2 udp 4002 mountd
100005 2 tcp 4002 mountd
100005 3 udp 4002 mountd
100005 3 tcp 4002 mountd

iptables information:
root@ubuntu0:~# iptables-save
# Generated by iptables-save v1.4.21 on Thu Jul 23 08:33:20 2015
*nat
:PREROUTING ACCEPT [1126:180378]
:INPUT ACCEPT [732:120854]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [1:60]
OCKER - [0:0]
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A POSTROUTING -s 172.17.0.0/16 ! -o docker0 -j MASQUERADE
-A POSTROUTING -s 172.17.0.11/32 -d 172.17.0.11/32 -p tcp -m tcp --dport 4011 -j MASQUERADE
-A POSTROUTING -s 172.17.0.11/32 -d 172.17.0.11/32 -p tcp -m tcp --dport 4002 -j MASQUERADE
-A POSTROUTING -s 172.17.0.11/32 -d 172.17.0.11/32 -p tcp -m tcp --dport 4001 -j MASQUERADE
-A POSTROUTING -s 172.17.0.11/32 -d 172.17.0.11/32 -p tcp -m tcp --dport 4000 -j MASQUERADE
-A POSTROUTING -s 172.17.0.11/32 -d 172.17.0.11/32 -p tcp -m tcp --dport 2049 -j MASQUERADE
-A POSTROUTING -s 172.17.0.11/32 -d 172.17.0.11/32 -p tcp -m tcp --dport 111 -j MASQUERADE
-A DOCKER -d 10.16.17.160/32 ! -i docker0 -p tcp -m tcp --dport 4011 -j DNAT --to-destination 172.17.0.11:4011
-A DOCKER -d 10.16.17.160/32 ! -i docker0 -p tcp -m tcp --dport 4002 -j DNAT --to-destination 172.17.0.11:4002
-A DOCKER -d 10.16.17.160/32 ! -i docker0 -p tcp -m tcp --dport 4001 -j DNAT --to-destination 172.17.0.11:4001
-A DOCKER -d 10.16.17.160/32 ! -i docker0 -p tcp -m tcp --dport 4000 -j DNAT --to-destination 172.17.0.11:4000
-A DOCKER -d 10.16.17.160/32 ! -i docker0 -p tcp -m tcp --dport 2049 -j DNAT --to-destination 172.17.0.11:2049
-A DOCKER -d 10.16.17.160/32 ! -i docker0 -p tcp -m tcp --dport 111 -j DNAT --to-destination 172.17.0.11:111
COMMIT
# Completed on Thu Jul 23 08:33:20 2015
# Generated by iptables-save v1.4.21 on Thu Jul 23 08:33:20 2015
*filter
:INPUT ACCEPT [1953:293693]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [109:9696]
OCKER - [0:0]
-A INPUT -p tcp -m tcp --dport 2049 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 111 -j ACCEPT
-A FORWARD -o docker0 -j DOCKER
-A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i docker0 ! -o docker0 -j ACCEPT
-A FORWARD -i docker0 -o docker0 -j ACCEPT
-A DOCKER -d 172.17.0.11/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 4011 -j ACCEPT
-A DOCKER -d 172.17.0.11/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 4002 -j ACCEPT
-A DOCKER -d 172.17.0.11/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 4001 -j ACCEPT
-A DOCKER -d 172.17.0.11/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 4000 -j ACCEPT
-A DOCKER -d 172.17.0.11/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 2049 -j ACCEPT
-A DOCKER -d 172.17.0.11/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 111 -j ACCEPT
COMMIT
# Completed on Thu Jul 23 08:33:20 2015