$ sudo tune2fs -l /dev/sda1
Password: 
tune2fs 1.42.13 (17-May-2015)
Filesystem volume name:   my-root
Last mounted on:          /
Filesystem UUID:          2b2b35a6-8f47-4fc2-9700-bda7fc1044cd
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              2445984
Block count:              9764864
Reserved block count:     488242
Free blocks:              3183059
Free inodes:              23
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8208
Inode blocks per group:   513
Flex block group size:    16
Filesystem created:       Tue Nov  1 08:38:50 2016
Last mount time:          Sun Dec 18 10:47:37 2016
Last write time:          Sun Dec 18 10:47:37 2016
Mount count:              20
Maximum mount count:      -1
Last checked:             Tue Nov  1 08:38:50 2016
Check interval:           0 (<none>)
Lifetime writes:          146 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      330c34f4-9c29-4b59-bb21-d8d00770e2e7
Journal backup:           inode blocks