As i understood the App store does not work in the 2017 Jan image for ATV.
So I did this:
sudo apt install debian-archive-keyring (needed to get the keys that apt update requires)
sudo apt update (runs through without errors)
sudo apt install smb-app-osmc (this returns with the following error:)
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package smb-app-osmc
is smb-app-osmc the correct package name? I cannot find it: sudo apt search smb | grep -i app