Genealogy make it very obvious. If your forefathers came from France, and your culture and ethnicity is consistent with what is French, then you are French. If your grandfather came from Senegal, what does it matter where you were born? French water is great, but it doesn't change your DNA.
Define native, most of, if not all of the colored in France today, are born in France.
Do they have to produce an ancestor passport at least 10-20 French generations back?
Genealogy make it very obvious. If your forefathers came from France, and your culture and ethnicity is consistent with what is French, then you are French. If your grandfather came from Senegal, what does it matter where you were born? French water is great, but it doesn't change your DNA.