/usr/share/dbus-1/services/org.gtk.Private.GPhoto2VolumeMonitor.service is in gvfs-backends 1.20.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gtk.Private.GPhoto2VolumeMonitor
Exec=/usr/lib/gvfs/gvfs-gphoto2-volume-monitor
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