@Override
          public int compare(Long l1, Long l2) {
            return l2.compareTo(l1);
          }
Map of families to all versions of its qualifiers and values.
<p>
Returns a three level Map of the form:
<code>Map&amp;family,Map&lt;qualifier,Map&lt;timestamp,value&gt;&gt;&gt;</code>
<p>
Note: All other map returning methods make use of this map internally.
@return map from families to qualifiers to versions
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Result.java