LinuxQuestions.org - suid on directory

Strange problem this...
Fiddling with permissions, want to set user and group in a directory by sticky bits. Setting group works - but not user?

It should be like this (taking from samba.doc):

Code:

$ chmod 6775 /foodbar

$ ls -al /foodbar/..

You should see:

drwsrwsr-x  2 jack  engr    48 2003-02-04 09:55 foodbar

Now type:

$ su - jill

$ cd /foodbar

$ touch Afile

$ ls -al

You should see that the file Afile created by Jill will have ownership and permissions of Jack, as follows:

-rw-r--r--  1 jack  engr    0 2003-02-04 09:57 Afile

So I did the same:
ls -l /shares/
drwsrwsrwx 2 saras larare 4096 18 jan 16.16 saras
As user pingu:
# cd /shares/saras
# touch afile
# ls -l
-rw-rw-r-- 1 pingu larare 0 18 jan 16.20 Afile

Why the he... isn't user saras???

Oh, I forgot: I'm running Fedora Core4