Folder shares over NFSv4 private to user groups

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http://serverfault.com – I want to share a folder over NFSv4, available to some users, and I'm having permission issues. I set up the folder permissions with setGID so new files are created with the folder group owner. But users are free to create files without permissions to the group (In fact, default users UMASK is 700, so this happens all the time). I ended up trying to apply this solution using ACLs to enforce directory umask. I did, but it didn't work as expected. I read on the NFS wiki that regular ACLs won't work over NFSv4, and that I need to use nfs4 specific ACL tools. But I'm having some trouble. I tr (HowTos)