Added the ancestor filter for listing containers

[halfzebra]

Hello friends,

Thanks for this library! 🙌

What did you implement:

I've been using shiplift for some automation and I've needed the support for the ancestor filter.

Filters containers which share a given image as an ancestor. Expressed as [:], , or image@digest

I hope this makes sense!

How did you verify your change:

Manually verified, should be the same as:

docker ps -a -q --filter ancestor=<name>

What (if anything) would need to be called out in the CHANGELOG for the next release:

Added the support for the ancestor filter. 🤷‍♂️