With the upcoming Windows 10 Redstone 4 (version 1803) users will be able to access files on-demand with Work Folders on Windows. It has been made official in a forum post in Windows Insider program along with the procedure to enable it on Windows
This file access feature enables you to see and access all of your files on Windows 10 when using an enterprise managed file server with Work Folders. You control which files are stored on your PC and available offline. The rest of your files are always visible and don’t take up any space on your PC, but you need connectivity to the Work Folders file server to access them.
Users running Windows 10 build 17063 or later can try out the feature now. To enable the feature, you can try any method given below:
Option #1: Work Folders setup wizard
When configuring Work Folders on a PC, verify the Enable on-demand file access on this PC setting is selected in the setup wizard.
Option #2: Work Folders control panel applet
If Work Folders is currently configured on a PC, open the Work Folders control panel applet and select the Enable on-demand file access setting.
Option #3: Work Folders group policy setting
Administrators can control the on-demand file access feature on PCs by setting the On-demand file access preference group policy setting.
These options can also be used to disable the on-demand file access feature if you want all files to be available offline on a PC.
For full documentation check here.