Did this ever get resolved? I am having the same issue with Parallels Version 12.2.1 (41615). Host: MacOS Version 10.12.6. Guest: Debian Stretch
On the host:
$ diskutil list
/dev/disk0 (internal):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme 500.3 GB disk0
1: EFI EFI 314.6 MB disk0s1
2: Apple_CoreStorage Macintosh HD 499.3 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +499.0 GB disk1
Logical Volume on disk0s2
C32D2445-D503-48B2-B0D3-8B899D6F1A4C
Unlocked Encrypted
$ ls -ld /Users/bangelo/
drwxr-xr-x+ 67 bangelo staff 2278 Sep 29 08:09 /Users/bangelo/
On the guest:
$ id
uid=1000(bangelo) gid=1000(bangelo) groups=1000(bangelo),20(dialout),24(cdrom),25(floppy),27(sudo),29(audio),30(dip),44(video),46(plugdev),108(netdev),111(bluetooth),118(scanner)
$ mount | grep psf
Home on /media/psf/Home type prl_fs (rw,nosuid,nodev,noatime,sync)
$ ls -ld /media/psf/
drwxr-xr-x 3 bangelo bangelo 4096 Sep 29 08:10 /media/psf/
$ ls -ld /media/psf/Home/
drwxr-xr-x 1 bangelo nogroup 2278 Sep 29 08:09 /media/psf/Home/
$ ls -ld /media/psf/Home/Downloads/
drwx------ 1 bangelo nogroup 170 Sep 28 21:18 /media/psf/Home/Downloads/
$ touch /media/psf/Home/Downloads/test
touch: cannot touch '/media/psf/Home/Downloads/test': Permission denied