The PS3 does not work well with iPods. Between that and the music format normally used on them that set up just will not work.
Did a bit of a search regarding network drives and the PS3 and it looks as if the PS3 will not recognize them- you may want to consider a regular external hard drive to store the music on. The PS3 should see it with the media sharing set up to connect to your computer (or skip the media sharing altogether and just use the external drive on the PS3).