Fixed BTRFS check
Fixed BTRFS check

Gordin/Layers-Dockerfiles,Gordin/Layers-Dockerfiles,learning-layers/Layers-Dockerfiles,Gordin/Layers-Dockerfiles,learning-layers/Layers-Dockerfiles,learning-layers/Layers-Dockerfiles,learning-layers/Layers-Dockerfiles,learning-layers/Layers-Dockerfiles,Gordin/Layers-Dockerfiles,Gordin/Layers-Dockerfiles