port granularity fixes from master branch

src/main/org/apache/tools/ant/types/selectors/DateSelector.java

@@ -42,7 +42,7 @@ public class DateSelector extends BaseExtendSelector {
     private long millis = -1;
     private String dateTime = null;
     private boolean includeDirs = false;
-    private long granularity = 0;
+    private long granularity = FILE_UTILS.getFileTimestampGranularity();
     private String pattern;
     private TimeComparison when = TimeComparison.EQUAL;
 

src/main/org/apache/tools/ant/types/selectors/MappingSelector.java

@@ -40,7 +40,7 @@ public abstract class MappingSelector extends BaseSelector {
     protected File targetdir = null;
     protected Mapper mapperElement = null;
     protected FileNameMapper map = null;
-    protected int granularity = 0;
+    protected int granularity = (int) FILE_UTILS.getFileTimestampGranularity();
 
     // CheckStyle:VisibilityModifier ON