Method statvfs

fs/subfs.cpp:208–212

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