How to tell what PPA my Linux Mint install is downloading docker.io from

I'm going down a rabid hole and realize downloading docker-ce instead of docker.io is probably better, but was curious to see when docker.io was last updated. I believe I've tracked it down to here https://launchpad.net/ubuntu/+source/docker.io However, I'm unsure how to tell which one it would install. The Lunar Lobster The Kinetic Kuda etc. Is there a command I can run on Linux Mint which would direct me to where my system retrieves install packages from? How would I determine which one/version of a particular package it would install?