list file system linux supports "please give the command or system call"
 

how can i know
what file system are supported by linux

please tell the command or systemcall

is there any system call by which i can
directly use it in a c program

/proc/filesystems is a text file, just use the standard read a text file system call.

/proc/filesystems will show you the currently supported fs on your system, not linux in general.
for example, unless ntfs module is loaded, ntfs will not show in /proc/filesystems