DataBase independent way of setting time fractions?

Question

How can I define column data type for datetime to store time fractions independently from DB platform? Now I am using code like that:

@Column(name = "DATE_TIME", columnDefinition = "datetime(3) NOT NULL")
@Temporal(TemporalType.TIMESTAMP)
private Date dateTime;

That is for MySQL over v.5 ("datetime(3) NOT NULL"). p.s. Using java.util.Date