Use chmod and chgrp/chown command to setup permission on files. For example only root should allow to see folder foo:
Code:
chmod 0700 foo
chown root:root foo
nfs bases its access control to files on the server machine on the uid and gid provided in each NFS RPC request. The normal behavior a user would expect is that she can access her files on the server just as she would on a normal file system. This requires that the same uids and gids are used on the client and the server machine.
In short use NIS to give same UID,GID to both client/server to permission works nicely.