/usr/lib/x86_64-linux-gnu/libnss_docker.so is in libnss-docker 0.02-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnss_docker.so.2.0.0
/usr/lib/x86_64-linux-gnu/libnss_docker.so.2.0.0