You can get an idea of how "full" a file is using zdb, e.g:
sudo zdb -O pool-ssd/virt ubuntu17.10-amd64-desktop.qcow2
Object lvl iblk dblk dsize dnsize lsize %full type
114737 3 128K 128K 14.0G 512 20.0G 84.49 ZFS plain file
in the above example, pool-ssd/virt was the pool + zfs file system and
ubuntu17.10-amd64-desktop.qcow2 was the name of the VM image.
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https://bugs.launchpad.net/bugs/1766308
Title:
inexplicably large file reported by zfs filesystem
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