/etc/apt/apt.conf.d/80-btrfs-snapshot is in apt-btrfs-snapshot 3.5.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | DPkg::Pre-Invoke {"if [ -x /usr/bin/apt-btrfs-snapshot ] && apt-btrfs-snapshot supported; then apt-btrfs-snapshot snapshot; fi "; };
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