Feature Request: Summary for all content that shows individual usage per guest #11

Is your feature request related to a problem? Please describe.
Right now (unless I missed something ) you can only check the whole datastore/namespace or a individual path/guest.

Describe the solution you'd like
A way to check invididual usage for all guests with a single command to be able to easily answer the question of which guest takes the most storage in the datastore.

Additional context
Unrelated but naming the file with uppercase letters is a strange/uncommon choice.