If you want to list what filesystems are exported via NFS on a remote host use this command:

showmount -e 192.168.1.12

You should get output like this:

Export list for 192.168.1.12:
/volume1/multimedia 192.168.1.0/24
/volume1/sales 192.168.1.0/24
/volume2/users 192.168.1.0/24