"Windows Network" doesn't work with recent samba versions, because
"client max protocol" has been changed from NT1 to SMB3 recently.
NT1 is mandatory for workgroup support. Let's force NT1 using the
newly added smbc_setOptionProtocols API if available. But force this
only when neither hostname, nor IP address is used. This among others
prevents complete breakage if NT1 is disabled on server. Use GResolver
to implement this heuristic.

https://bugzilla.gnome.org/show_bug.cgi?id=780958