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`qemu-img info` reports an incorrect actual-size when the underlying posix filesystem has transparent compression
qemu-img info reports the same thing as `du`*1024:
$ qemu-img info --output json ./my.qcow2 | jq '."actual-size"'
558619648
$ du ./my.qcow2
545527 ./my.qcow2
$ echo $((558619648 / 545527))
1024
and this is correct in terms of bytes on disk, but due to transparent compression implemented by the filesystem, it is not the actual byte count:
$ du -h --apparent-size ./my.qcow2
1346568192 my.qcow2
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