How to custom the fetch metrics by docker containers?

Hi to everyone!
I'm new to kibana and elasticsearch.
I've seen that in kibana is possible to fetch metrics by docker containers.
How can i custum this metric to fetch the consumption disk space of a container ?
And if i want to fetch an information contains in the docker inspect's output, how can i do this?
Thank you for you attention.

Have you looked at the docker Metricbeat module?