Can you explain the story of Das Ganu and how Baba showed him that Shirdi was as holy as Prayag?

Chapter 4 recounts an experience of Das Ganu, who wished to travel to Prayag to bathe in the holy rivers on a special day. When he sought Baba's permission, Baba advised him against the journey, stating, "This itself is our Prayag; keep firm faith in your mind." A true miracle then occurred. As Das Ganu bowed at Baba's feet, water representing the sacred Ganga and Yamuna rivers began to drip from Baba's big toes. Witnessing this incredible event, Das Ganu was overcome with emotion, realizing the profound sanctity of being with Baba was equivalent to a pilgrimage.