Can you explain the miracle involving Sapatnekar and the Dhangar woman?

The miracle involving the Dhangar (shepherd) woman was a profound display of Sai Baba's omniscience. While Sapatnekar was massaging Baba's feet, the woman arrived and sat down to rub Baba's waist. Baba then began a conversation with her, seemingly telling a story about a merchant. As Chapter 48 details, Sapatnekar listened carefully and was shocked to realize that the story was, in fact, his own life story. Baba recounted everything from Sapatnekar's birth to the present, even mentioning the painful death of his son. The true miracle was that Baba was narrating this intimate history to a woman who had no connection to it, while the intended audience was Sapatnekar himself, proving that Baba knew every detail of his life.