SONOS can find a music library only in shares, not in folders under shares. That is, it will index all music files in all folders and subfolders in a share, but you can't point to a specific folder to be indexed, only to shares. Since the DNS-321 automatically has \\NAS\Volume_1 and \\NAS\Volume_2 as shares for the entire drive, I need to be able to define shares for specific folders on a volume (say, \\NAS\Volume_1\Music)