The question that is not really a question at all
In many places a greeting takes the shape of an enquiry, and the answer expected is not information.
A great many greetings are shaped like questions. Where are you going, have you eaten, how are things, are you well. They arrive with the intonation of an enquiry and the function of a hello. The expected reply is not an account of your day but a return of the gesture, sometimes the same question sent back, sometimes a short set phrase that everybody in that setting knows. The words have been worn smooth by use until only the shape remains, and the shape is what carries the meaning: I have noticed you, and I wish you well.
Confusion arrives when somebody takes the question literally. Answering a ritual enquiry with real detail can land as oversharing, or simply as a conversational stall, while answering a genuine enquiry with a set phrase can land as evasion. The trouble is that the two look identical from outside, and even within one household the same words may be ritual on the way past the kitchen and sincere at the end of a hard week. Tone, timing and whether the speaker slows down are the only reliable clues, and they are not always reliable.
The workable approach is to answer briefly and leave a door open. A short phrase that returns the courtesy, followed by a pause. If the enquiry was ritual, the pause costs nothing and the conversation moves on. If it was genuine, the pause is an invitation and the other person will step through it. This works in both directions and requires no knowledge of which convention is in play, which is precisely what makes it useful when you cannot possibly know.