Method statfs

fs/subfs.cpp:203–207

            return underlayfs->syncfs();
        }
        virtual int statfs(const char *path, struct statfs *buf) override
        {
            PathCat __(this, path);
            return underlayfs->statfs(path, buf);
        }
        virtual int statvfs(const char *path, struct statvfs *buf) override
        {
            PathCat __(this, path);