/usr/lib/x86_64-linux-gnu/libatasmart.so is in libatasmart-dev 0.18-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libatasmart.so.4.0.4
/lib/x86_64-linux-gnu/libatasmart.so.4.0.4