I'm sorry, I thought you were talking about an NTFS Windows NT/2000 volume. In your case for using a Network Appliance Storage solution it does not suppor the Windows NT/2000 security.
All security and sharing is typically done by its own sharing much like a Windows 9x shares the directory with its given
permissions, but can not secure the files like NTFS can.

Please read the manual for advise on setting up the Shares.
You need to pay special attention to how the shares are setup so that you do not expose the entire volume to a security risk by
accidentally allowing someone to get Full access from another share that can get to other directories.

Windows 2000 allows MAP ROOT to any folder level, Windows 9x does not.
That is why they see the main Share level and everything below. Definetely not a secure approach, but many companies appear to be using these devices because of
the cheap cost. As I said, please review the manual to setup the shares properly.

Sorry I can't really be much more help on this for you.