title: Single glob expression to match contents of subdirectory with given name but not contents of (parent) directory with such name
body: <p>Given the following paths:</p>
  
  <pre><code>@c8y/apps
  @c8y/client
  project-a/@c8y/client
  project-b/@c8y/client
  foo/@c8y/client
  bar/@c8y/client
  baz/@c8y/client
  qux/@c8y/client
  </code></pre>
  
  <p>I expect to match only the entries that have "@c8y" as the subdir:
  <code>
  ☒ @c8y/apps
  ☒ @c8y/client
  <strong>☑ project-a/@c8y/client</strong>
  <strong>☑ project-b/@c8y/client</strong>
  <strong>☑ foo/@c8y/client</strong>
  <strong>☑ bar/@c8y/client</strong>
  <strong>☑ baz/@c8y/client</strong>
  <strong>☑ qux/@c8y/client</strong>
  </code></p>
  
  <p>I tried <code>**/@c8y/**</code> and <code>{!,**/}@c8y/**</code> but failed and pretty much stuck afterwards </p>
  
  <p>Is there a single glob expression that can achieve this?</p>