title: Why sp_who2 not filtering results based on `@loginame` parameter?
body: <p>I'm not refering to filtering sp_who2 as in following question 
  <a href="https://stackoverflow.com/questions/2234691/sql-server-filter-output-of-sp-who2">SQL Server: Filter output of sp_who2</a> but rather in regards of using the <code>@loginame</code> parameter to only get results back for specific user. </p>
  
  <p>For example:</p>
  
  <pre><code>EXEC sp_who @loginame = 'sa' 
  
  EXEC sp_who2 @loginame = 'sa' 
  </code></pre>
  
  <p>When running <code>sp_who</code> with <code>@loginame</code> parameters results are filtered only to specific user, but that behavior is not in <code>sp_who2</code>. </p>