Is there a "SELECT LAST_SERIAL()"?

When using "IDENTITY" as my primary key, I can select the last inserted ID with 

SELECT LAST_IDENTITY() FROM %TSQL_sys.snf;

Actually this is how Hibernate + Iris' Driver acquires the inserted ID when mapping with

@GeneratedValue(strategy = GenerationType.IDENTITY)

Now, considering that I am using the type "SERIAL" as my primary key instead, how can I get the last inserted ID?

Note that with "SERIAL" I can forcefully insert any value for this ID, from which Iris will continue generating values...

CREATE TABLE test (
    test_id serial NOT NULL,
    name varchar(100) NULL,
    CONSTRAINT pk_test PRIMARY KEY (test_id)
);

INSERT INTO test (test_id, name) values (10, 'test 10'); --inserted "test_id" value: 10
SELECT LAST_IDENTITY() FROM %TSQL_sys.snf; --returned value: 1

INSERT INTO test (name) values ('test 11'); --generated "test_id" value: 11
SELECT LAST_IDENTITY() FROM %TSQL_sys.snf; --returned value: 2

Also, how could I map this kind of ID using Hibernate? I was thinking about implementeing an "IdentifierGenerator", but is there a simpler solution?