How to get file metadata?

How to get extensive filesystem information about a file?

I have a file that consistently causes errors in my backup utility (Unison). I'm trying to narrow down a bug and find out how it is different from other files. I copied that file and a copy backups fine so bug is not related to file contents. Then I renamed original to make sure a bug is not related to a filename.

So now I have 2 files with exact same contents, same xattrs (I checked) but one of them causes backup to fail. What else could be different between those files?

Also it is not a single case. I have many similar problem files all of which are created by the same program (DaVinci Resolve)