How did Sai Baba's interaction with Sapatnekar reveal Baba's divine nature as described in the Satcharitra?

Sai Baba's interaction with Sapatnekar revealed his divine nature by demonstrating his omniscience and his unity with all beings. After Sapatnekar was astonished to hear his life story from Baba's mouth, he wondered how Baba could know such things. Chapter 48 of the Shri Sai Satcharitra explains that for Baba, everything was as clear as "a gooseberry in the palm of the hand." This is because Baba is the "form of Brahman" and the entire universe is his family; he has manifested as the universe itself. For one who is merged with the Supreme Being, there is no duality of "mine" and "thine." The incident showed that Baba is a great "knower of the inner self," transcending the limits of an ordinary person.