title: how to shrink/resize apfs?
body: <p>I want to shrink the boot file system's size(formatted as APFS), how to do it?</p>
  
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  <p>In macOS Sierra, <code>HFS+</code> can be shrunk without reboot/remount(in <code>disk utility</code>), but in macOS High Sierra, it seems impossible.</p>