/usr/share/gvfs/mounts/dns-sd.mount is in gvfs-backends 1.22.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4
[Mount] Type=dns-sd Exec=/usr/lib/gvfs/gvfsd-dnssd AutoMount=true