This file is indexed.

/lib/systemd/system/var-lib-machines.mount is in systemd-container 229-4ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

[Unit]
Description=Virtual Machine and Container Storage
ConditionPathExists=/var/lib/machines.raw

[Mount]
What=/var/lib/machines.raw
Where=/var/lib/machines
Type=btrfs
Options=loop