[NFS-Ganesha-Support] Restricting root's FS access

Hi, I'm currently working to set up ganesha with kerberos. Everything seems to work as expected, except that I can't find a way to limit the access that root on the client has to the mounted filesystem. At the moment I'm squashing root to 'nobody' - however that obviously still allows access to world-readable files/dirs. Is there a way to block all FS access from root/nobody, or always require a valid kerberos ticket? Thanks, Matthew