I am curious and did not read the docs: Does ZFS deduplication work on parts of files? I would have expected that filesystem deduplication just deduplicate comp

I am curious and did not read the docs: Does ZFS deduplication work on parts of files? I would have expected that filesystem deduplication just deduplicate complete files (for conveniance). Deduplication of file parts could of course be good for some types of files, with a fixed structure and with no "noise" -- but with videos, there is no chance I guess without manually linking parts.