How did Sai Baba uniquely reveal his knowledge of Sapatnekar's entire life without speaking to him directly?

While Sapatnekar was massaging Baba's feet, a shepherd (Dhangar) woman arrived and began to rub Baba's waist. According to Chapter 48 of the Shri Sai Satcharitra, Baba then started a conversation with her. As Sapatnekar listened carefully, he was shocked to find that every word of the conversation was his own life story, disguised as a tale about a merchant. The story was so detailed that it even included the painful memory of his late son's death. This indirect method proved Baba's omniscience to the astonished Sapatnekar.