This is the whole motivation for taking the lane on narrow roads. If there isn't room for a car to pass you while staying on your side of the lane, they need to pass you by crossing into the other lane. By riding in the middle of the lane, you ensuring that they do this. If you ride too close to the edge of the road in these situations, the car may try to pass where there isn't room and it's clear who's going to lose in this situation.