Comment 56 for bug 206439

There might be some details that help shed more light on the situation here: http://mail.gnome.org/archives/gvfs-list/2008-May/msg00005.html

Specifically:
- we have username, domain, server and share parameters available to be
set into mountspec. However username and domain shouldn't be set unless
we really need them. At the moment, non-anonymous mounts have both
username and domain set which confuses Nautilus.
This causes troubles when user gvfs-mount's smb://server/share but
gvfs-ls can't find this location mounted then because it has username
and domain set in mountspec.