?config_client:(Ftp_client.ftp_client -> unit) ->
?tmp_directory:string ->
?tmp_prefix:string ->
?get_password:(string -> string) ->
?get_account:(string -> string) ->
?keep_open:bool ->
?tls_config:(module Netsys_crypto_types.TLS_CONFIG) ->
?tls_enabled:bool -> ?tls_required:bool -> string -> Ftp_fs.ftp_stream_fs
