pi@raspberrypi:~ $ apt-cache policy samba
samba:
  Installed: (none)
  Candidate: 2:4.5.12+dfsg-2+deb9u1
  Version table:
     2:4.5.12+dfsg-2+deb9u1 500
        500 http://mirrordirector.raspbian.org/raspbian stretch/main armhf Packages
        100 /var/lib/dpkg/status