NTFS permissions not working on new ISILON cluster

Hi All, new to Isilon and this forum.

need some help to resolve the issue. I've new cluster using OpenFS 8.2. created few test SMB shares and windows admin mapped to server/desktop. problem is that if we add 'authenticated users' group in access list everyone is able to see and access the shares even Windows admin give access to few users through NTFS. it seems like NTFS permissions are not effective and Share permissions have precedence. please advise where i'm missing.