Postgres 12

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CREATE TABLE tabm (oid integer primary key);
SELECT AddGeometryColumn ('public','tabm','geom',25832,'MULTILINESTRINGM',3);

addgeometrycolumn

public.tabm.geom SRID:25832 TYPE:MULTILINESTRINGM DIMS:3

INSERT INTO tabm(oid,geom) VALUES 
(1,'SRID=25832;MULTILINESTRINGM ((572929 5831262 300, 572929 5831562 400))'::geometry); 
1 rows affected

SELECT ST_AsText(geom) FROM tabm; 

st_astext

MULTILINESTRING M ((572929 5831262 300,572929 5831562 400))

SELECT ST_AsText(i.geom),ST_M(i.geom) FROM tabm,
LATERAL ST_DumppOINTS(geom) i(j);

st_astext
st_m

POINT M (572929 5831262 300)
300

POINT M (572929 5831562 400)
400

st_astext	st_m
POINT M (572929 5831262 300)	300
POINT M (572929 5831562 400)	400