Here is the result of running ADMIXTURE on the three African HapMap-3 populations, using about 440K SNPs, including Tuscans as a non-African group.
The Tuscans are in purple and show no trace of African admixture. All the other populations are separated: red: Luhya (Bantu); green: Maasai (Nilotes); Yoruba (Niger-Congo).
The two east African groups show asymmetrical affinities: the Maasai have some Luhya red, while the Luhya have little Maasai green, while they have substantial West African turqoise, consistent with the origin of their Bantu language.
Related: ADMIXTURE on HapMap-3 populations