[CentOS] sudoers

Hi,

I need to run /bin/mount and /sbin/mount.cifs commands as nobody user
(it has (bin/bash shell).

So, I've edited /etc/sudoers and added:

Cmnd_Alias    CMD_MOUNT = /bin/mount
Cmnd_Alias    CMD_CIFS ) = /sbin/mount.cifs

nobody           ALL = NOPASSWD: CMD_MOUNT
nobody           ALL = NOPASSWD: CMD_CIFS

But when I run the command as nobody (in the shell), I get the error:
"mount error 1 = Operation not permitted"

Any ideas ?

Any help would be appreciated.

Warm Regards,
Mário Gamito