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Nexus 5X (32GB)
 D:\Software\Android\platform-tools>fastboot.exe format cache
Creating filesystem with parameters:
    Size: 100663296
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 6144
    Inode size: 256
    Journal blocks: 1024
    Label:
    Blocks: 24576
    Block groups: 1
    Reserved block group size: 7
Created filesystem with 11/6144 inodes and 1422/24576 blocks
target reported max download size of 536870912 bytes
erasing 'cache'...
OKAY [  0.087s]
sending 'cache' (5688 KB)...
OKAY [  0.265s]
writing 'cache'...
OKAY [  0.071s]
finished. total time: 0.425s
 D:\Software\Android\platform-tools>fastboot format system
Creating filesystem with parameters:
    Size: 3221225472
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 8192
    Inode size: 256
    Journal blocks: 12288
    Label:
    Blocks: 786432
    Block groups: 24
    Reserved block group size: 191
Created filesystem with 11/196608 inodes and 25785/786432 blocks
target reported max download size of 536870912 bytes
erasing 'system'...
OKAY [  0.612s]
sending 'system' (52216 KB)...
OKAY [  1.786s]
writing 'system'...
OKAY [  0.520s]
finished. total time: 2.921s
 D:\Software\Android\platform-tools>fastboot format userdata
Creating filesystem with parameters:
    Size: 27283927040
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 8176
    Inode size: 256
    Journal blocks: 32768
    Label:
    Blocks: 6661115
    Block groups: 204
    Reserved block group size: 1024
Created filesystem with 11/1667904 inodes and 148720/6661115 blocks
target reported max download size of 536870912 bytes
erasing 'userdata'...
OKAY [  4.894s]
sending 'userdata' (138993 KB)...
OKAY [  4.670s]
writing 'userdata'...
OKAY [  1.441s]
finished. total time: 11.014s
 D:\Software\Android\platform-tools>