Solution:
To filter the view result by parent, You will require to add a "Post relataionship" query filter from your "Query Filter" section of your view/block view and set the option "The post where the view is sown".
Problem: I would like to add a post owner filter to a View of a Repeatable Field Group (RFG). I am building this View in the Blocks editor, but I cannot see any way to add a dynamic filter based on the post being displayed.
Solution: Select the top-level View block using the Block Navigation menu, then you will find a Query Filter configuration panel in the right column of the Block Editor screen. You can add a post owner filter or any other Query Filter here. In an upcoming release of Views, you will be prompted to select this filter during the creation of the View. This improved workflow will help resolve this confusion.
