Timestamp granularity is not an issue in the continuous model of time. The adjective ``timestamp'' is used to distinguish this kind of granularity from other kinds of granularity, such as the granularity of non-timestamp attributes (+E9,+E1). ``Time granularity'' is much too vague a term since there is a different granularity associated with temporal constants, timestamps, physical clocks, and the time-line clock although all these concepts are time-related.