Masks may filter droplets but any mask that could effectively filter viruses would suffocate you in seconds
I thought that also, but FFP-3 class masks effectively protect the wearer from droplet aerosols, protein molecules, viruses, bacteria, fungi and spores, and even from highly dangerous dusts such as asbestos fibers. BUT!
Protection only works if many other protective measures are taken at the same time: Strict hygiene when putting on a mask, protective goggles, gloves and plastic apron or overall, proper disposal of possibly contaminated disposable items and regular hand washing. In addition, the surroundings must always be systematically disinfected.

IT is not really a solution unless all steps are followed and even then sh*t happens.

https://www.ecowatch.com/coronavirus-face-masks-2645078070.html?rebelltitem=3#rebelltitem3