Info about resampling method applied to obtain S2 cloud masks

AT the following link:
https://sentinel.esa.int/web/sentinel/technical-guides/sentinel-2-msi/level-1c/cloud-masks
there is a short description to obtain Sentinel 2 cloud mask available in L1C product. Here I read that processing is performed with data sampled at 60 m spatial resolution for all spectral bands. It could be interesting to give more details on the method (or software) used for this resampling. Please, can anyone help me? Thanks