...
idmap config NT AUTHORITY : base_rid = 0
idmap config NT AUTHORITY : range = 1200000-1299999
idmap config NT AUTHORITY : backend = rid
idmap config BUILTIN : base_rid = 0
idmap config BUILTIN : range = 1000000-1099999
idmap config BUILTIN : backend = rid
idmap config REGIONS : base_rid = 100
idmap config REGIONS : range = 100-999999
idmap config REGIONS : backend = rid
idmap config REGIONS : default = yes
idmap config * : range = 1300000-1999999
idmap config * : backend = rid# man dd
...
seek=n Seek n blocks from the beginning of the output before copying.
On non-tape devices, an lseek(2) operation is used. Otherwise,
existing blocks are read and the data discarded. If the user
does not have read permission for the tape, it is positioned
using the tape ioctl(2) function calls. If the seek operation
is past the end of file, space from the current end of file to
the specified offset is filled with blocks of NUL bytes.
...# ls -l /
...
drwxr-xr-x 10 root root 4096 мая 30 2014 usr
#ls -l /usr
...
drwxr-xr-x 2 root root 36864 дек. 4 17:20 bin
drwxr-xr-x 2 root root 4096 апр. 11 2014 games
drwxr-xr-x 94 root root 12288 авг. 17 18:41 include
drwxr-xr-x 71 root root 12288 авг. 21 13:31 lib
drwxr-xr-x 10 root root 4096 июня 13 2014 local
drwxr-xr-x 2 root root 12288 сент. 23 15:58 sbin
drwxr-xr-x 150 root root 4096 авг. 21 13:31 share
drwxr-xr-x 11 root root 4096 мая 20 2015 srcwhich mysqldump