lessfs appears to do block level deduplication (like ZFS). This means that if I copy a huge file but add a few bytes at the start, I won't get any benefit from

lessfs appears to do block level deduplication (like ZFS). This means that if I copy a huge file but add a few bytes at the start, I won't get any benefit from deduplication because the data doesn't align anymore with the original block boundaries. I wonder if there is a way to improve on that?