Afghan here.

When I was a kid, my dad would tell me about our clan's origin story.

Basically, as Pashtuns (and some other ethnicities mixed in there), we trace our origins to Ancient Greece, and not just that, but as descendants of great greek conquerors who came and eventually settled on that land. Our origin story is all oral, (since my dad told me, and his dad told him, etc etc down the generations), so I am not sure how to corroborate them, but various things of the Afghan culture are linked to practices from Greece, etc.

I remember listening to his stories as a kid and not really caring, but now that I am older, they are really quite interesting!