I say, and with God's success: The wiping over the socks is not invalidated by the exit of the lesser part of the foot; because the amount considered for the foot to exit the sock is the exit of the greater part of the foot to the leg of the sock; as the greater has the ruling of the whole; however, the exit of the lesser part of the foot does not invalidate the wiping due to the hardship it entails. Refer to: Sharh Al-Wiqayah p. 116, and Radd Al-Muhtar 1: 183, and God knows best.