title: Relationship between Azure SAS allowed services and allowed resource types
body: <p>I am reading the Azure SAS documentation (<a href="https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/constructing-a-service-sas" rel="noreferrer">https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/constructing-a-service-sas</a>) and I am confused with the relationship between allowed resource Types and Azure services.</p>
  
  <p>If I go to storage account -> shared access signature, the first thing I have to select is Allowed Services (Blob, file, queue, table). Then the Allowed resource types (Service, Container and Object).</p>
  
  <p>Now a Blob service has container in it, but a file, queue or table does not have containers in them. So why is Container option provided in allowed resource type for file, queue and table service?</p>