Some additional information:
I enabled the debug output for autofs4 module: echo -n 'module autofs4 +p' > 
/sys/kernel/debug/dynamic_debug/control
According to the kernel log, the mount is reported busy: 
autofs4:pid:7051:autofs4_mount_busy: returning = 1

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https://bugs.launchpad.net/bugs/1754506

Title:
  AutoFS does not automatically umount SMB shares

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