Hi Gosvinta
The filter only find the person that done the last update in the record, not the previous changes. All changes in specific field can show it in the component history as part of the Time Machine data inside the Inspector but, right now, this information is not searchable in the filter.

Therefore, the filter will find the person who made the last change and works in the same way as any other previous version (v5, v4, etc), this behaviour was not changed.
We are implementing a Process task portal to add this kind of information, but is not finished.
So, as @elena said, filling in the Authorship field might be the way to go until Process taks is implemented.
Best