option :: :read_write | :sync_on_put | {:max_file_size, Integer.t} | {:open_timeout, Iteger.t} | {:expiry_secs, Integer.t} | {:max_fold_age, Integer.t} | {:max_fold_puts, Integer.t}
options :: [option]
t :: [ref: reference, folder: String.t, options: List.t]