/usr/share/gvfs/mounts/gphoto2.mount is in gvfs-backends 1.30.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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[Mount] Type=gphoto2 Exec=/usr/lib/gvfs/gvfsd-gphoto2 AutoMount=false