What is the story of Das Ganu and the holy rivers as recounted in Chapter 22 of the Shri Sai Satcharitra?

Chapter 22 narrates a profound incident involving the devotee Das Ganu. When Das Ganu expressed a desire to go on a pilgrimage to Prayag for a holy bath, Baba advised him against it. Instead, Baba instructed him that his own big toe was the equivalent of Prayag. As mentioned in the chapter, when Das Ganu placed his head on Baba's feet in faith, the sacred waters of both the Ganga and Yamuna rivers miraculously manifested from Baba's toe, satisfying the devotee's spiritual longing right there in Shirdi. This story highlights the Guru's omnipresence and the sanctity of his physical form.