/usr/bin/cinnamon-screensaver-command is in cinnamon-screensaver 3.2.13-4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #! /bin/sh
exec /usr/share/cinnamon-screensaver/cinnamon-screensaver-command.py "$@"
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