It's going to depend on what NAS you have (and what you've got running on it).
I have a Netgear ReadyNAS which has a DLNA and rudimentary TiVo support so I see it at the bottom of the My Shows list. When I select it, it shows a list of folders which I have identified to the ReadyNAS's DLNA server. This initially made me think that the TiVo would "see" any DLNA server, but that isn't true (at least as of today, supposedly it's a feature that's been mentioned before), it is only working because of the ReadyNAS's additional TiVo support.
So what NAS do you have? (edit: oops, missed that your NAS is a Seagate Goflex_Home, I can't tell what cpu it uses or if you can install other utilities for it to run such as pyTivo.)
Last edited by mlippert; 01-06-2013 at 10:15 AM.
Reason: missed info from original post, so fleshed out reply