I think this has probably been discussed here.. but I'm getting
confused about how to determine actual disk usage of zfs filesystems.

Here is an example:

 $ du -sb callisto
 46744   callisto

 $ du -sb callisto/.zfs/snapshot
  86076   callisto/.zfs/snapshot

Two questions then.

I do need to add those two to get the actual disk usage right?

Is something wrong here... there are only 2 snapshots there.
And I've seen it mentioned repeatedly about how little space snapshots
take. 

It is rsync'd data from a remote.. but I did use the --inplace flag.
The whole command used:

  rsync -avvz -L --delete 
  --exclude-from=/www/rexcl/callisto_exclude.txt 
  --inplace --delete-excluded 
  rea...@callisto.jtan.com:/home/reader/public_html/ /www/callisto/

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