The earliest direct father's  line acending Reshetnick found in the scripts is:

a horseman (the Cherkass cossack) Karp(yushka) Reshetnick(ov), a presumed direct ancestor (of the 11th generation).

B: approx. 1630. Korsun', Cherkasy voivodeship, Polish-Lithuanian Kingdom.

D: before 1685. Veldivatskaya sloboda, Podgorodny stan, Korsun' district, Kazan' region, Moscow Kingdom.