How to filter elements visibility by visibility / graphics overrides ?

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Hi
I have trouble by get the viewplan elements with revit files linked with another revit file.
So there is a Entrance revit file A and a linked revit file B, so the B is the sub-file.
I am trying to fetch the elements of the viewplan. I did it good for the A file, let's say LEVEL-1.
But the file B have LEVEL-1 too.
When I open the file B separately, I found that some of the elements are visible.
But in linked file A, it's not, then I realize it's been controlled by the visibility/graphics overrides setting!!!
The problems is I can only fetch the elements through file B's document, then I don't know how to deal with this.
I mean HOW CAN I KNOW THE ELEMENTS IN FILE B IS VISIBLE OR NOT ACCORDING TO FILE A's visibility/graphics overrides setting?
Thanks a lot