How to use the pyfuse3.StatvfsData function in pyfuse3

async def statfs(self, ctx):
        log.debug('started')

        stat_ = pyfuse3.StatvfsData()

        # Get number of blocks & inodes
        blocks = self.db.get_val("SELECT COUNT(id) FROM objects")
        inodes = self.db.get_val("SELECT COUNT(id) FROM inodes")
        size = self.db.get_val('SELECT SUM(size) FROM blocks')

        if size is None:
            size = 0

        # file system block size, i.e. the minimum amount of space that can
        # be allocated. This doesn't make much sense for S3QL, so we just
        # return the average size of stored blocks.
        stat_.f_frsize = max(4096, size // blocks) if blocks != 0 else 4096

        # This should actually be the "preferred block size for doing IO.  However, `df` incorrectly
        # interprets f_blocks, f_bfree and f_bavail in terms of f_bsize rather than f_frsize as it

async def statfs(self, ctx):
        stat_ = pyfuse3.StatvfsData()

        stat_.f_bsize = 512
        stat_.f_frsize = 512

        stat_.f_blocks = 0
        stat_.f_bfree = 20
        stat_.f_bavail = 20

        thing = len(self._inode_map)
        stat_.f_files = thing
        stat_.f_ffree = thing + 2
        stat_.f_favail = thing + 2

        return stat_