Butt joint on granite tile? I have read that you can butt granite tile surrounded by dry...

I have read that you can butt granite tile surrounded by dry areas but wet areas call for a 1/16 inch grout line. I assume to be precise to prevent moisture leaks. Have read that you can butt united and use resin to seal joint. Some one said a contractor uses unsanded grout but that seems close to it would easily chip out since we're chitchat a very small amount. Does anyone near experience know what the best way to stamp the butt line?
Answers:    unsanded grout is the approach to go and after setting for 48 hours use a accurate quality grout sealer on it.
i agree near previous answer, used in tub 3 yrs and still looks great