Command:
```sh
$ fastboot oem partition help
```

Output:
```sh
(bootloader) usage: fastboot oem partition [options]
(bootloader)
(bootloader) options:
(bootloader)   (none given)                     list all partitions
(bootloader)   <name>                           list a partition
(bootloader)   dump <name> [<offset> [size]]    dump a partition
(bootloader)   md5 <name> [<offset> [size]]     md5 of a partition
(bootloader)   sha256 <name> [<offset> [size]]  sha256 of a partition
(bootloader)   help                             show usage
```