/lib/systemd/system/multipathd.socket is in multipath-tools 0.7.4-2ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=multipathd control socket
DefaultDependencies=no
Before=sockets.target
[Socket]
ListenStream=@/org/kernel/linux/storage/multipathd
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