Some years ago (2017-09-26) I asked in stackoverflow and in Apple Developer Forum if there is a way to identify if a file is a clone. 3 years later, no response or update of macOs tools to get this. My motivation, like others who also want an answer ( I guess 😄 ), is create a tool that analyze entire disk and create clones of files with same content. (use clone APFS feature at maximum possible).