public static Path getMobFamilyPath(Configuration conf, TableName tableName, String familyName) {
    return new Path(getMobRegionPath(conf, tableName), familyName);
  }
Gets the family dir of the mob files. It's
{HBASE_DIR}/mobdir/{namespace}/{tableName}/{regionEncodedName}/{columnFamilyName}.
@param conf       The current configuration.
@param tableName  The current table name.
@param familyName The current family name.
@return The family dir of the mob files.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java