[ubuntu] Permissions and NFS mounts

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http://ubuntuforums.org – I've created an NFS share on my ubuntu 12.04 machine and am now trying to properly set up permissions on it. I want to allow access to the share only to members of a specific group, in this case cerberusaccess I got it working on the ubuntu machine by creating the group, adding the proper users to it, and then changing the group of the directory to cerberusaccess and setting its permissions to rwxrwx---, which (as I understand it) makes it read/writable by the owner and group members, but no one else. Now I want to have the same privileges from my os x laptop, but I just get permission d (Hardware)