Running stat on a directory gives a size of on ext3 gives a size of
- Running stat on a directory on NTFS gives a size of 0.
If you copy some files to another FS the total size is different and it
falsely appears that some data is lost.
We're not trying to count the disk usage, otherwise we'd be looking at
block usage not adding up individual files. Therefore this patch removes
including the directory size as it's a meaningless value.