It takes brass to open a coffee dispensary in the San Francisco these days. But cuppa joe impresario Aiden Compton has worked in the neighborhood for Peet’s, La Boulangerie and Starbucks, and is blood-related to a family-owned Brooklyn outfit called Variety Coffee. So he took over the tiny Samovar Tea shop at 1910 Fillmore earlier this year determined to bring back the old neighborhood feeling to the ’Mo.