As I understand, lat/long is continuous, plus codes are discrete. If I give you my lat/long, how many decimals do I use? Will you be able to tell me from my ne

As I understand, lat/long is continuous, plus codes are discrete. If I give you my lat/long, how many decimals do I use? Will you be able to tell me from my neighbor? What if someone moves in to the same house as me, what’s they’re lat/long distinct from mine?