This is part of Gnome and it's used by the system when you connect to a remote server (ftp, webdav, ssh):
userspace virtual filesystem - server
gvfs is a userspace virtual filesystem where mount runs as a separate processes which you talk to via D-Bus. It also contains a gio module that seamlessly adds gvfs support to all applications using the gio API. It also supports exposing the gvfs mounts to non-gio applications using fuse.
This package contains the gvfs server that provides gvfs mounts to all gio applications, and the minimal set of backends.