/usr/lib/libXsettings-client.so.0 is in libxsettings-client0 0.17-9~deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libXsettings-client.so.0.0.0
/usr/lib/libXsettings-client.so.0.0.0