This file is indexed.

/etc/apparmor.d/lxc/lxc-default-with-mounting is in lxc-common 2.0.7-0ubuntu1~16.04.2.

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

The actual contents of the file can be viewed below.

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# Do not load this file.  Rather, load /etc/apparmor.d/lxc-containers, which
# will source all profiles under /etc/apparmor.d/lxc

profile lxc-container-default-with-mounting flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/lxc/container-base>

# allow standard blockdevtypes.
# The concern here is in-kernel superblock parsers bringing down the
# host with bad data.  However, we continue to disallow proc, sys, securityfs,
# etc to nonstandard locations.
  mount fstype=ext*,
  mount fstype=xfs,
  mount fstype=btrfs,
}