I tried using nsfd last night and used:
fs-nfs2 192.168.1.101:/MACHD /mac
I got the /mac sub-directory on the Audrey, in the root directory. Opening it brought up only a few of the items in the MACHD directory, as you described.
I set PhJuke to look in /MACHD in its settings screen. Running PhJuke again shows the partial MACHD directory. One of the folders had MP3s in it. Opening it similarily showed only a few files. I was able to select an MP3 and play it without a skip.
Is this what you're getting Jim?
Right now the only problems are mounting a selected directory instead of the whole volume (really only a minor inconvenience), and getting the Audrey to display the contents of the whole directory (this is a deal-breaker at this point).