From my associate here at the Evaluator Group, Dennis Martin: I'm not sure if there are any restrictions on this relative to a NetApp Filer, but here is the general solution.
Install Microsoft Services for UNIX (SFU) on the NTFS server, and enable the Server for NFS. This will allow UNIX admins to access files on the NTFS server using standard NFS protocols and commands and should allow permission changes. The NFS Server deals with the permission differences between UNIX and NTFS.
This was first published in June 2001