VSM.AttachTmo() uses time.Truncate().

internal/pkg/vsm/vsm.go

@@ -95,16 +95,16 @@ func (v *VSM) Error() string {
 }
 
 // AttachTmo sets the timeout for attaching to a Varnish instance. If
-// the Duration, rounded to seconds toward 0s, is >= 0s, then wait
-// that many seconds to attach. If the Duration < 0s, wait
-// indefinitely. By default, the Varnish default timeout holds (5s in
-// recent Varnish versions).
+// the Duration, truncated to seconds, is >= 0s, then wait that many
+// seconds to attach. If the Duration < 0s, wait indefinitely. By
+// default, the Varnish default timeout holds (5s in recent Varnish
+// versions).
 func (v *VSM) AttachTmo(tmo time.Duration) error {
 	if err := v.checkNil(); err != nil {
 		return err
 	}
 	arg := "off"
-	secs := tmo / time.Second
+	secs := tmo.Truncate(time.Second)
 	if secs >= 0 {
 		arg = strconv.FormatUint(uint64(secs), 10)
 	}