Yes, I'm aware that you didn't claim this did exactly what the OP
wanted. I wasn't disagreeing with you - but simply wanting to make sure
that I understood what you were saying.
In the example which I cited, the Gallery app seems to be able to find
pictures wherever they are on an Android device, and display thumbnails
- and then display the actual picture when you tap on a thumbnail. AIUI,
the OP wants to be able to do the same thing with pictures stored on a
network share without first having to copy them to the Android device.
Is this sort of thing possible with a rooted device?