Filevault for all volumes I'm using High Sierra, I have my main Macintosh HD encrypted using Filevault. However in Disk Utility there is an option to create new volumes that share space with container. So finally I have volumes Macintosh HD but also Documents, Music and so on. In Disk Utility I can see now:


Macintosh HD - APFS (encrypted)
Documents - APFS
Music - APFS


As you see there is no information for additional volumes that there are also encrypted.

So the question is - are those volumes encrypted or not (and how can I verify that) and if they are not encrypted how can I encrypt them too using FileVault?

This is screen how it looks like in Disk Utility. As you see this Dokumenty partition is not showed as encrypted but when I choose Macintosh HD there is APFS (encrypted)



This is result of diskutil list:

(internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         250.8 GB   disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +250.8 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            93.6 GB    disk1s1
   2:                APFS Volume Preboot                 22.9 MB    disk1s2
   3:                APFS Volume Recovery                509.8 MB   disk1s3
   4:                APFS Volume VM                      4.3 GB     disk1s4
   5:                APFS Volume Dokumenty               12.2 GB    disk1s5
   6:                APFS Volume Oprogramowanie          1.9 GB     disk1s6
   7:                APFS Volume D                       18.2 GB    disk1s7
   8:                APFS Volume Muzyka                  35.3 GB    disk1s8
   9:                APFS Volume Inne                    2.9 MB     disk1s9
  10:                APFS Volume S                       2.0 GB     disk1s10
  11:                APFS Volume L                       7.1 MB     disk1s11
When you adding APFS container, you should be able to use APFS (Encrypted)



I found that after added, it will be shown as 'APFS (Encrypted)' in Disk Utility.app. In diskutil list, no encryption status is metioned.

I didn't find out how to encrypt / unencrypt an existing APFS volume in Disk Utility.app. Maybe some diskutil command will do it.