[childintime]

This isn't a task you should be doing. Simply put, an OS should keep record of where you got things from, and where it was sent/copied to. That info should stay with you when moving between computers. It should try to tag the files accordingly.

Disk indexing isn't enough to answer "where is that file", when you moved it for example to cold-storage.

Note that by this definition Windows is not an OS :) Linux came closest with the failed Nepomuk.