“After a while Ratan rose, and went off to the kitchen to prepare the meal; but she was not so quick about it as on other days. Many new things to think of had entered her little brain. When the postmaster had finished his supper, the girl suddenly asked him: ‘Dada, will you take me to your home ?’
The postmaster laughed. ‘What an idea !’ said he; but he did not think it necessary to explain to the girl wherein lay the absurdity.
That whole night, in her waking and in her dreams, the postmaster’s laughing reply haunted her ‘What an idea !’”
Tagore, Sir Rabindranath. “The Postmaster.” Mashi and other stories, Macmillan and Co., 1918, page 166-167
This passage shows that the narrator knows about all of Rattan’s actions throughout the story, as well as her inner thoughts that she has, since it describes what she does both around the postmaster and by herself, as well as when there are a lot of thoughts swarming her mind and what she even dreams about, so this suggests that the narrator of “The Postmaster” is not the postmaster or any other character in the book that may be observing Ratan’s actions, but a third person narrator that is not part of the story and whom has access to the actions and consciousness of both of the main characters of this story, which are Ratan and the postmaster. The only person in the story that could have access to all of Ratan’s actions and thoughts would be Ratan herself, but the narrator does not use the word “I” when talking about Ratan nor use her language throughout the whole story, and since Ratan would not be able to know all of the postmaster’s actions and thoughts as well, which is also shown in this passage when the narrator says that the postmaster did not feel the need to explain how odd Ratan’s request to him was. It is also implied that the narrator may be older than Ratan and/or has sympathy for what she goes through, since it refers to her and her brain as “little,” which could mean that the narrator views Ratan as a young girl who is not done growing yet, but also sees her as a nice girl since referring to her as “little” multiple times could show that the narrator cares about Ratan in some way, or that the narrator thinks that the amount of thoughts going on in Ratan’s head might be too much for her to handle and would easily overwhelm her.